Drill steel retainer



March 7, 1933. D.K. DOVELL DRILL STEEL RETAINER Filed Nov. 4, 1950 0001.5) If. DOVELL.

M ,4 Wm a HTTK Patented Mar. 7, 1933 DUDLEYK. DOVELL, PA SO, TEXAS, ASSIGNOR 1'0 SULLIVAN MACHI'NKR COMPANY, A CORPORATION OF MASSACHUSETTS- DRILL STEEL "RETAINER Application ma november 4,1930. Serial No. 493,423.

Myinvention relates to retainers, and more particularly to tool retainers for hammer rock drills.

Anobject of my invention is to provide an improved "tool retainer. Another obj ect of myinventionis to provide "an improved tool retainer whose component {parts are simple and'are readily manufacturedand assembled. A further object of my invention is to provide the improved tool retainer-in which the benefits of a shock absorbing spring separate from the side rod springs: are secured, while yet the exterior of the tool retaining mech anism has only a "single movable part, the

resilientshock absorbing means being wholly housed within the casing of the drilling' apparatus. "Other objectsrand advantages of the invention will hereinafter more fully appear. 1

In the accompanying drawing, in which I have shown for purposes of illustration one form which my invention may assume in practice,

Fig. l is a fragmentary :side elevation of a rock drilling mechanism showing the forwardend of the latter provided with the illustrative embodiment of my invention.

Fig. 2 is an axial 'se'ct'ionth-rough the forward end of the drilling mechanism "of Fig.

' 1, the section being taken on a plane at right angles to the view of Fig. 1.

Fig. 3 is a front end view of 'the mechanism shown in Fig. 1.

Referring to the drawing, it will be noted that my invention in its illustrative form is with the other parts of the drill byusual side rods '3, retainer springs 4, washers 5 and nuts 6. Within the chuck housing 2 is rotatably mounted a chuck driving sleeve 7 withinmized and, moreover, the retainer 25 1s adaptwhich is secured a chuck member proper '8 having a polygonal bore 9 for thereception of the shank 3100f a drill steel 11. 12 is the collar ofthe drill steel. Rotation isimpa-rted to the chuck driving sleeve 7 through a nut 14 having a sliding connection through A splines :15 with grooves 16 in the striking bar extend into the bore of the chuck housing 2 "readily due to the position of these bosses 17 of the piston of the drilling motor (not 2 shown). The forward end of the chuck housing 2 is :provided with a central opening 20 large enough to permit the free passage of the collar 12 of the drill steel 11. Theopening 20 is surrounded by an inwardly turned flange-21 which provides-a radially extending surface 22 against which aretainer spring 23 reacts. V The other end of the spring engages an annular member 24 having an 'openingfi --therein slightly larger than the collar 12 of thedrill steel and which is positioned just vforwardlyof the front end of the chuck member proper 8. A retainer yoke 25 having a yoke portion26 adapted to be engaged by the collar 12 on the drill steel and prevent com- 7 plete withdrawal of the latter, is providedat its rear end with a'pair of retainer extending bearing portions 27 which are permitted to through elongated slots 28 formed in the forward portion ofthe chuckhousing. The

inner ends of these bearing portions 27are receivedin recesses 29 in the annularmember 24. Bosses 30 formed on the exterior of the chuck housing are adapted to hold the retainer in retaining position when it is moved thereto,it being noted that theretainor may be sprung into retaining position near the free ends of the retainer yoke. The slots 28 are of sufficient length to provide for all possible forward movement necessary adequately to absorb theimpact of the steel without any engagement of the pivot portions 27 with the forward ends of the slots. Preferably the movement toward'the rear endof the drill of the annular member 24 is limited by engagement of the bearing portions 27, with the rear ends of the slots 28 in a; position such that there is no engagement between the member 24 and the front end of the chuck member 8. Wear is thusvminied to be held against loose swing-ing move-1. ment by the frictional engagement of 1 the bearing portions 27 with the rear endsof the slots 28 under the pressure of the spring 23. From the foregoing description it will be clearly apparentthat I have provided a sim-.

ple and improved tool retaining mechanism in which it is unnecessary to rely upon the resilience of the side rod springs, but in which there is provided a safely enclosed separate spring for this purpose. It 'ill be noted, moreover, that the disposition of the spring and the general arrangement of the parts, leaves the forward end of the drilling mechanism with but a single external movable part. It will further be observed that the entire device is of a rugged construction.

While there is in this application specifically described one form which this invention may assume in practice, it will'be understood that this form of the same is shown for purposes of illustration and that the invention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. In a tool retaining mechanism, a chuck for receiving a collared drill steel, a chuck housing for receiving said chuck and having formed in its opposite side walls longitudinally elongated slots, a drill steel. retainer yoke arranged externally of said chuck housing and having inwardly projecting portions extending into said slots, said yoke presenting an abutment against which the steel collar is adapted to strike, and means arranged Within said chuck housing for resiliently supporting said retainer yoke in retaining position including a spring coaxial with the chuck housing and a ring pressed by said spring and having engagement with said inwardly projecting yoke portions, said spring and ring being arranged to surround the drill steel supported in said chuck.

2. In a tool retaining mechanism, a chuck for receiving a collared drill steel, a chuck housing for receiving said chuck and having formed in its opposite side walls longitudinally elongated slots, a drill steel retainer yoke arranged externally of said chuck housing and having inwardly projecting portions extending into said slots, said yoke presenting an abutment against which the steel collar is adapted to strike, and means arranged within said chuck housing for resiliently supporting said retainer yoke in retaining position including a spring coaxial. with the chuck housing in advance of said chuck and a ring pressed by said spring and having engagement with said inwardly projecting yoke portions, said spring and ring being enclose-d within said chuck housing and arranged to surround the drill steel supported in said chuck.

3. In a tool retaining mechanism, a chuck for receiving a collared drill steel, a chuck housing for receiving said chuck and having formed in its opposite side walls longitudinally elongated slot-s, a drill steel. retainer yoke arranged externally of said chuck housing and having inwardly projecting portions extending into said slots, said yoke presenting an abutment against which the steel collar is adapted to strike, and means arranged Within said chuck housing for resiliently supporting said retainer yoke in retaining position including a spring coaxial with the chuck housing in advance of said chuck and. a ring pressed by said spring and having engagement with said inwardly projecting yoke portions, said spring and ring bemg enclosed Within said chuck housing and arranged to surround the drill steel supported in said chuck and said ring having bores therein receiving said inwardly projecting yoke portions.

4. In a tool retaining mechanism, a chuck housing having a bore, a chuck in said bore for receiving a collared drill steel, said chuck housing having formed in its opposite side walls longitudinally elongated slots opening into said bore in advance of said chuck, a pivoted retainer yoke arranged externally of said chuck housing and having end portions projecting through said slots into said bore, said yoke presenting an abutment against which the steel collar is adapted to strike, and a coil spring in said bore acting on said projecting end portions for yieldably maintaining said yoke in retaining position.

5. In a. tool retaining mechanism, a chuck housing having a bore, a chuck in said bore for receiving a collared drill. steel, said chuck housing having formed in its opposite side walls longitudinally elongated slots opening into said bore in advance of said chuck, a pivoted retainer yoke arranged ex ternally of said chuck housing and having end portions projecting through said slots into said bore, said yoke presenting an abutment against which the steel collar is adapted to strike, a collar guided in said here and engaging said projecting end portions, and a coil spring in said bore acting on said collar for yieldably maintaining said yoke in retaining position.

6. In a tool retainin mechan sm, a chuck housing having a bore, a chuck in said here for receiving a collared drill. steel, said chuck housing having formed in its opposite side walls longitudinally elongated slots opening into said here in advance of said chuck, a pivoted retainer yoke member arranged externally of said chuck housing and presenting an abutment against which the steel collar is adapted to strike, a collar member guided in said bore, one of said members having portions projecting through said slots to connect said yoke member to said collar member, and a coil spring in said bore encircling the drill steel and acting on said collar member for yieldably maintaining said yoke in retaining position.

7. In a tool retaining mechanism, a drill chuck for receiving a collared drill steel, a. chuck housing having formed in its opposite side walls longitudinally elongated slots, an

annular member guided in said chuck housing, a coil spring arranged within said chuck housing for urging said annular member rearwardly, said annular member and spring being arranged in said chuck to surround the drill steel supported in said chuck, and a drill steel retainer yoke member arranged externally of said chuck housing and pivotally mounted on said annular member, said yoke having side arms extending along the sides of the chuck housing and a transverse stop portion connecting the forward ends of saidside arms and against which the steel collar is adapted to strike, one of said members having portions projecting through said slots to connect said yoke member to said annular member and said spring and annular member cooperating to yieldably maintain said yoke.

in retainmg position.

8. In a tool retaining mechanism, adrill chuck for receiving a collared drill steel, a chuck housing having formed in its opposite side walls longitudinally elongated slots, an

annular member guided in said chuck housing, a coil'spring arranged within said chuck housing for urging said annular member rearwardly, said annular member and spring being arranged in said chuck to surround the drill steel supported in said chuck, and a drill steel retainer yoke member arranged externally of said chuck housing and pivotally mounted on said annular member, said yoke having side arms extending along the sides of the chuck housing and a transverse stop portion connecting the forward ends of said side arms and againstwhich the steel collar is adapted to strike, one of said members having portions projecting through said slots to connectsai-d yoke member to said annular member and said projecting portions being engageable with the rear ends of said slots to limit rearward movement of said an nular member, said spring and annular member cooperating to yieldably maintain said yoke in retaining position. 7

In testimony whereof I aifix my signature.

DUDLEY K. DOVELL. 

